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<title>Utilities: Clutter Gst 3.0.18
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<a name="clutter-gst-Utilities"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="clutter-gst-Utilities.top_of_page"></a>Utilities</span></h2>
<p>Utilities — Utility functions for Clutter-Gst.</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
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<div class="refsect1">
<a name="clutter-gst-Utilities.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/clutter/clutter-General.html#ClutterInitError"><span class="returnvalue">ClutterInitError</span></a>
</td>
<td class="function_name">
<a class="link" href="clutter-gst-Utilities.html#clutter-gst-init" title="clutter_gst_init ()">clutter_gst_init</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/clutter/clutter-General.html#ClutterInitError"><span class="returnvalue">ClutterInitError</span></a>
</td>
<td class="function_name">
<a class="link" href="clutter-gst-Utilities.html#clutter-gst-init-with-args" title="clutter_gst_init_with_args ()">clutter_gst_init_with_args</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html"><span class="returnvalue">GstElement</span></a> *
</td>
<td class="function_name">
<a class="link" href="clutter-gst-Utilities.html#clutter-gst-create-video-sink" title="clutter_gst_create_video_sink ()">clutter_gst_create_video_sink</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="clutter-gst-Utilities.description"></a><h2>Description</h2>
<p>The <span class="application">Clutter-Gst</span> library should be initialized
with <a class="link" href="clutter-gst-Utilities.html#clutter-gst-init" title="clutter_gst_init ()"><code class="function">clutter_gst_init()</code></a> before it can be used. You should pass pointers to
the main argc and argv variables so that GStreamer, Clutter and Clutter-Gst
gst can process their own command line options, as shown in the following
example:</p>
<div class="example">
<a name="id-1.6.3.4.3"></a><p class="title"><b>Example 1. Initializing the Clutter-Gst library</b></p>
<div class="example-contents">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="gtkdoc kwb">int</span>
<span class="function">main</span> <span class="gtkdoc opt">(</span><span class="gtkdoc kwb">int</span> argc<span class="gtkdoc opt">,</span> <span class="gtkdoc kwb">char</span> <span class="gtkdoc opt">*</span>argv<span class="gtkdoc opt">[])</span>
<span class="gtkdoc opt">{</span>
<span class="gtkdoc slc">// initialize the Clutter-Gst library</span>
<span class="function"><a href="clutter-gst-Utilities.html#clutter-gst-init">clutter_gst_init</a></span> <span class="gtkdoc opt">(&</span>argc<span class="gtkdoc opt">, &</span>argv<span class="gtkdoc opt">);</span>
<span class="gtkdoc opt">...</span>
<span class="gtkdoc opt">}</span></pre></td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="example-break"><p>It's allowed to pass two NULL pointers to <a class="link" href="clutter-gst-Utilities.html#clutter-gst-init" title="clutter_gst_init ()"><code class="function">clutter_gst_init()</code></a> in case you
don't want to pass the command line arguments to GStreamer, Clutter and
Clutter-Gst.</p>
<p>You can also use a <a href="https://developer.gnome.org/glib/unstable/glib-Commandline-option-parser.html#GOptionEntry"><span class="type">GOptionEntry</span></a> array to initialize your own parameters
as shown in the next code fragment:</p>
<div class="example">
<a name="id-1.6.3.4.6"></a><p class="title"><b>Example 2. Initializing the Clutter-Gst library with additional options</b></p>
<div class="example-contents">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
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30</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="gtkdoc kwb">static</span> GOptionEntry options<span class="gtkdoc opt">[] =</span>
<span class="gtkdoc opt">{</span>
<span class="gtkdoc opt">{</span> <span class="string">"framerate"</span><span class="gtkdoc opt">,</span> <span class="string">'f'</span><span class="gtkdoc opt">,</span> <span class="number">0</span><span class="gtkdoc opt">,</span> G_OPTION_ARG_INT<span class="gtkdoc opt">, &</span>opt_framerate<span class="gtkdoc opt">,</span>
<span class="string">"Number of frames per second"</span><span class="gtkdoc opt">,</span> NULL <span class="gtkdoc opt">},</span>
<span class="gtkdoc opt">{</span> <span class="string">"fourcc"</span><span class="gtkdoc opt">,</span> <span class="string">'o'</span><span class="gtkdoc opt">,</span> <span class="number">0</span><span class="gtkdoc opt">,</span> G_OPTION_ARG_STRING<span class="gtkdoc opt">,</span>
<span class="gtkdoc opt">&</span>opt_fourcc<span class="gtkdoc opt">,</span> <span class="string">"Fourcc of the wanted YUV format"</span><span class="gtkdoc opt">,</span> NULL <span class="gtkdoc opt">},</span>
<span class="gtkdoc opt">{</span> NULL <span class="gtkdoc opt">}</span>
<span class="gtkdoc opt">};</span>
<span class="gtkdoc kwb">int</span>
<span class="function">main</span> <span class="gtkdoc opt">(</span><span class="gtkdoc kwb">int</span> argc<span class="gtkdoc opt">,</span> <span class="gtkdoc kwb">char</span> <span class="gtkdoc opt">*</span>argv<span class="gtkdoc opt">[])</span>
<span class="gtkdoc opt">{</span>
GError <span class="gtkdoc opt">*</span>error <span class="gtkdoc opt">=</span> NULL<span class="gtkdoc opt">;</span>
gboolean result<span class="gtkdoc opt">;</span>
<span class="keyword">if</span> <span class="gtkdoc opt">(!</span><span class="function"><a href="https://developer.gnome.org/glib/unstable/glib-Deprecated-Thread-APIs.html#g-thread-supported">g_thread_supported</a></span> <span class="gtkdoc opt">())</span>
<span class="function"><a href="https://developer.gnome.org/glib/unstable/glib-Deprecated-Thread-APIs.html#g-thread-init">g_thread_init</a></span> <span class="gtkdoc opt">(</span>NULL<span class="gtkdoc opt">);</span>
result <span class="gtkdoc opt">=</span> <span class="function"><a href="clutter-gst-Utilities.html#clutter-gst-init-with-args">clutter_gst_init_with_args</a></span> <span class="gtkdoc opt">(&</span>argc<span class="gtkdoc opt">, &</span>argv<span class="gtkdoc opt">,</span>
<span class="string">" - Test YUV frames uploading"</span><span class="gtkdoc opt">,</span>
options<span class="gtkdoc opt">,</span> NULL<span class="gtkdoc opt">, &</span>error<span class="gtkdoc opt">);</span>
<span class="keyword">if</span> <span class="gtkdoc opt">(</span>error<span class="gtkdoc opt">)</span>
<span class="gtkdoc opt">{</span>
<span class="function"><a href="https://developer.gnome.org/glib/unstable/glib-Warnings-and-Assertions.html#g-print">g_print</a></span> <span class="gtkdoc opt">(</span><span class="string">"%s</span><span class="gtkdoc esc">\n</span><span class="string">"</span><span class="gtkdoc opt">,</span> error<span class="gtkdoc opt">-></span>message<span class="gtkdoc opt">);</span>
<span class="function"><a href="https://developer.gnome.org/glib/unstable/glib-Error-Reporting.html#g-error-free">g_error_free</a></span> <span class="gtkdoc opt">(</span>error<span class="gtkdoc opt">);</span>
<span class="keyword">return</span> EXIT_FAILURE<span class="gtkdoc opt">;</span>
<span class="gtkdoc opt">}</span>
<span class="gtkdoc opt">...</span>
<span class="gtkdoc opt">}</span></pre></td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="example-break">
</div>
<div class="refsect1">
<a name="clutter-gst-Utilities.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="clutter-gst-init"></a><h3>clutter_gst_init ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/clutter/clutter-General.html#ClutterInitError"><span class="returnvalue">ClutterInitError</span></a>
clutter_gst_init (<em class="parameter"><code><span class="type">int</span> *argc</code></em>,
<em class="parameter"><code><span class="type">char</span> ***argv</code></em>);</pre>
<p>Utility function to initialize both Clutter and GStreamer.</p>
<p>This function should be called before calling any other GLib functions. If
this is not an option, your program must initialise the GLib thread system
using <a href="https://developer.gnome.org/glib/unstable/glib-Deprecated-Thread-APIs.html#g-thread-init"><code class="function">g_thread_init()</code></a> before any other GLib functions are called.</p>
<div class="refsect3">
<a name="id-1.6.3.5.2.6"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>argc</p></td>
<td class="parameter_description"><p> The number of arguments in <em class="parameter"><code>argv</code></em>
. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>argv</p></td>
<td class="parameter_description"><p> A pointer to an array. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=argc][<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.6.3.5.2.7"></a><h4>Returns</h4>
<p> A <a href="/usr/share/gtk-doc/html/clutter/clutter-General.html#ClutterInitError"><span class="type">ClutterInitError</span></a>.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="clutter-gst-init-with-args"></a><h3>clutter_gst_init_with_args ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/clutter/clutter-General.html#ClutterInitError"><span class="returnvalue">ClutterInitError</span></a>
clutter_gst_init_with_args (<em class="parameter"><code><span class="type">int</span> *argc</code></em>,
<em class="parameter"><code><span class="type">char</span> ***argv</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *parameter_string</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Commandline-option-parser.html#GOptionEntry"><span class="type">GOptionEntry</span></a> *entries</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *translation_domain</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>This function does the same work as <a class="link" href="clutter-gst-Utilities.html#clutter-gst-init" title="clutter_gst_init ()"><code class="function">clutter_gst_init()</code></a>. Additionally, it
allows you to add your own command line options, and it automatically
generates nicely formatted --help output. Clutter's and GStreamer's
<a href="https://developer.gnome.org/glib/unstable/glib-Commandline-option-parser.html#GOptionGroup"><span class="type">GOptionGroup</span></a>s are added to the set of available options.</p>
<p>Your program must initialise the GLib thread system using <a href="https://developer.gnome.org/glib/unstable/glib-Deprecated-Thread-APIs.html#g-thread-init"><code class="function">g_thread_init()</code></a>
before any other GLib functions are called.</p>
<div class="refsect3">
<a name="id-1.6.3.5.3.6"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>argc</p></td>
<td class="parameter_description"><p> The number of arguments in <em class="parameter"><code>argv</code></em>
. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>argv</p></td>
<td class="parameter_description"><p> A pointer to an array. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=argc][<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>parameter_string</p></td>
<td class="parameter_description"><p>a string which is displayed in
the first line of <code class="option">--help</code> output, after
<code class="literal"><em class="replaceable"><code>programname</code></em> [OPTION...]</code></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>entries</p></td>
<td class="parameter_description"><p>a <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>-terminated array of <a href="https://developer.gnome.org/glib/unstable/glib-Commandline-option-parser.html#GOptionEntry"><span class="type">GOptionEntry</span></a>s
describing the options of your program</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>translation_domain</p></td>
<td class="parameter_description"><p>a translation domain to use for translating
the <code class="option">--help</code> output for the options in <em class="parameter"><code>entries</code></em>
with <code class="function">gettext()</code>, or <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>a return location for errors</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.6.3.5.3.7"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/clutter/clutter-General.html#CLUTTER-INIT-SUCCESS:CAPS"><code class="literal">CLUTTER_INIT_SUCCESS</code></a> on success, a negative integer
on failure.</p>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-gst-create-video-sink"></a><h3>clutter_gst_create_video_sink ()</h3>
<pre class="programlisting"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html"><span class="returnvalue">GstElement</span></a> *
clutter_gst_create_video_sink (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Creates a new <a class="link" href="clutter-gst-Video-Sink.html#ClutterGstVideoSink"><span class="type">ClutterGstVideoSink</span></a> initialized with Clutter's Cogl context.</p>
<div class="refsect3">
<a name="id-1.6.3.5.4.5"></a><h4>Returns</h4>
<p> the newly created <a class="link" href="clutter-gst-Video-Sink.html#ClutterGstVideoSink"><span class="type">ClutterGstVideoSink</span></a>. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="api-index-3-0.html#api-index-3.0">3.0</a></p>
</div>
</div>
<div class="refsect1">
<a name="clutter-gst-Utilities.other_details"></a><h2>Types and Values</h2>
</div>
</div>
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